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2002 GMC Yukon:
Passenger Side Power Windows Quit Working

Alex Steele
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The passenger side power windows on my 2002 GMC Yukon 4X4 quit working. What could it be?




Windows being the plural form of the word is important. We know that both the right-front and right-rear power window motors are inoperable. Since it's uncommon that two power window motors burn up at the same time, we need to find out what the two components have in common.


I pulled up the appropriate wiring schematic with the ALLDATA information system. The window motor circuits are a bit complex, so I'll try and keep it simple. Both the R/F and R/R power window motors receive power (12volts) and a path to ground through the R/F and R/R window switches, while the master window switch (driver's door) supplies just a ground circuit to the front and rear switches to remotely trigger the two passenger side windows.


The windows go up and down by reversing polarity to the motors (switching positive and negative). There's not a whole lot in common with the two windows in question until we take a look at the main power sources for both. 12volts is coming from what's called the RAP#2 relay, while the L/F and L/R windows get power from the RAP#1 relay. A failure at RAP#2 or its related wiring and components does explain why both windows on the right side don't work, but the ones on the left do.


RAP stands for Retained Accessory Power and the relays are controlled by the ignition switch and the Body Control Module (BCM). RAP#2 relay is located in the fuse block on the right side of the instrument panel and there's a 50amp fuse marked RAP#2 you can check in the fuse block under the hood. We could guess at the exact point of failure, but the circuits should be tested by a pro before replacing any parts.


Related Topics:  

GMC | Relay/Fuse | Power Windows | Wiring/Circuits
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19 Jan 2013, 05:21
If the Master switch works intermittently then usually the problem is a damaged wire at the door jam. The wiring harness runs from the master switch through the door and out to the rest of the car. Specially since the door has been opened and shut often over the last 25 yrs. This would be the first place I looked. If you have already looked here and are certain it is the Master Switch then have it replaced. The Price of the part is normal for a dealer part with a slight shop markup. You can buy one online for $63.79 from RockAuto.com but you would not get the shops warranty with that part.$75.00 might be a minimum charge and is normal at most shops. If this price includes the shops diagnosing the problem, then it is a very fair price. As with all repairs, get them to guaranty the repair in writing.A repair shop is a business just like Best Buy or KFC. They are there to make money. You can find a better deal for just about anything they sell but can you trust the x-brand to be as good of quality????? Not usually .


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